Frequency multiplier



Dec. 26, 1939. J. l.. REINARTZ FREQUENCY MULTIPLIER Filed April 8, 193? SSN INVENTOR J. L. RE/NARTZ1 BY l ATTORNEY narran STATES ewan FREQUENCY `IWULTIPLIER,

John L. Reinartz, Manchester, Conn., assigner to Radio Corporation of America, ya corporation of Delaware Application April 8, 1937, Serial No. 135,627

3 Claims. (Cl. Z50- 36) This application concerns an improved means by circuits including capacities NC connecting for multiplying the frequency of wave energy. the anode Il of tube Ill to the grid 4 of tube I6, In describing my invention reference will be and the anode I2 of tube I6 to the grid 2 of tube made to the attached drawing wherein the single I4. Biasing potential for the gridsl of tubes I4 figure illustrates an embodiment of my novel freand It may be supplied by a source 29 connected 5 quency doubler circuit. to a point on the inductance of circuit I0. Anode In investigating the behavior of present day potential for the tubes I4 and I6 may be supplied tubes (such as RCA type 808) in the push-pull by a source 25 connected to a point on the indoubler circuit of well known type to discover ductance of tuned circuit I8.

I" why such tubes gradually lost output power, AlthoughI have shown my circuit as including le especially when the circuit was originally a neutriode tubes, tubes having a greater number of tralized push-pull circuit of the conventional electrodes may be utilized therein by appropriatetype, but with the tubes re-arranged and conly modifying the circuit arrangement.

` u nected in parallel at their output for push-push As shown on the diagram the circuit I8 is tuned "e doubling, I found that although the second harto double the fundamental frequency and when i5 monic was cancelled in the push-pull circuit so tuned has a fundamental current curve as when doubling insofar as the tuning circuit was shown.l The circuit I8 also has a second har-` concerned, when a load is coupled to this tuning monic voltage curve as shown. The currents in circuit, I could obtain second harmonic output two halves ofthe inductance of I8 flow in opposite` from the conventional push-pull circuit when sense as indicated by the arrows Ih. Consequent-vzo tuned to the second harmonic by the novel exly, the fields of the two halves of the inductance pedient of using as said load, a split output pickof I8 are in opposite sense. By connecting the up coil and so connecting the two portions of pick-ups 20 and 22 in series and coupling them the split pick-up coil that the elds, instead of to the inductance of It so that the elds of 2U and g5 being in series, are connected in opposition, one 22 are in opposite sense, the induced currents are 25 portion of the coil being coupled to the plate end caused to add, and the tubes feed successively of the one tube and the other portion of the into the load circuit 343 so that each tube con-` output pick-up coil being coupled to the plate tributes its portion of the second harmonic power end of the second tube. Thus, my novel pushgenerated each half cycle. The inductances 20 pull frequency doubler diifers from doublers and 22 may be coupled to the ends of the winding 30 known in the prior art of the push-push output I8 as shown.

otros type without doing away with all of the advan- I claim: tages attendant on the use of neutralizing con- 1. In a frequency doubler circuit, a pair of densers. electron discharge tubes each having a control In other words, my invention eliminates the electrode, an anode, and a cathode, 4a circuit 35 necessity of using push-push doubler circuits tuned to a fundamental frequency connecting known heretofore by vproviding a new and imsaid control electrodes in push-pull relation and proved push-pull circuit with the output tuned to said cathode, a circuit including inductance to the second harmonic and with split output tuned to twice the fundamental frequency conpick-up coils coupled to the ends of the pushnecting said anodes in push-pull relation and to 40 pull circuit in such a manner that each tube Seid eathOdeS, a load, a separate piek-11p COi supplies the external circuit with its contribu- Coupled t0 eeveh end 0f Said induetanee 0f said tion of the Second harmonie power generated last named tuned circuit, and means connecting each half cycle by each push-pun connected tube. Said 0011s in series with said load.

In the drawing, wave energy of a fundamental 2- In a frequency doubler' CilCiii' a pail 0f 45' frequency to be deubled is supplied to a, circuit electron discharge tubes each having a control IIl tuned to the fundamental frequencyfand from eieC'rOde, en ed1101i@ eieCiTOder and a Cathode m te the grids 2 and 4 0f a, pair of electron djselectrode, a circuit tuned to a fundamental freeharge devices I4 and la The tubes 2 and 4 quency connecting said control electrodes in 5o have their cathodes 6 and 8 connected to ground Push-P1111 FelaiiOIl and t0' Said Cathode, means 50 as shown and their anodes I0 and I2 connected fOr impressing Wave energy 0f Seid fundamental to a circuit I 3 tuned to twice the fundamental frequency 0n Said tuned Circuit, e Circuit in? frequency or 2f. The load 30 is coupled by two cluding an inductance connecting said anodes in pick-up inductances 20 and 22 to the tuned cirpush-pull relation and to said cathode, means cuit I8. The tubes I4 and I6 may be neutralized for tuning said last named circuit to double the 55 fundamental frequency, neutralizing condensers connecting the anode of one of said tubes to the control electrode of the other of said tubes and the anode of the latter tube to the control electrode of the rst tube, a load circuit and inductances coupled to opposite ends of the inductance in said last named tuned circuit connected in series with said load circuit.

3. In a frequency doubler circuit a pair of electron discharge tubes each havi a control electrode, an anode electrode, and a cathode electrode, a circuit tuned to a fundamental frequency connecting said control electrodes in push-pull relation and to said cathode, means for impressing Wave energy of said fundamental frequency on said tuned circuit, a circuit including an inductance connecting said anodes in push-pull relation and to said cathode, means for tuning said last named circuit to double the fundamental frequency, neutralizing condensers connecting the anode of one of said tubes to the control electrode of the other of said tubes and the anode of the latter tube to the control grid electrode of the rst tube, a load circuit and separate series inductances coupled to opposite ends of the inductance in said last named tuned circuit connected in series With said loady circuit.

JOHN L. REINARTZ. 

